Question

ChiBank Best Buy Credit TD Auto Fb Cuny Blackboard Cuny a Prime video Netflix Tools Add-ons Help Last edit was seconds ago al text 3 5 6 Arial 12 BIU A C + IE 2 16- At 870 mm Hg, a sample of gas takes up 4.25L at 25 °C. If the pressure in the gas is increased to 2.40 atm at 25 °C, what will the new volume be? a) 400 L b) 2.03 L c) 8.50 L d)1541 L 17- How many o bonds and TT bonds are in following molecule? a) 17o and 4 TI c) 12 o and 4 TT b) 17 o and 3 TT d) 19o and 4 TT 18- How many valence electrons does H,PO, have? b)B2 c) 42 a) 30 d) 22 19- which of the following molecules does have a central atom with SP2 hybridization? (Hint: you should know the correct Lewis structure of these molecules to answer this question) a) H0 b) NH, C) CO d) BH, 20. What is the pressure in atm of a 0. 108 mol sample of the gas at a temperature of 20.0°C if its volume is 0.505L? (R=0.0821 L. atm/mol.K) a) 8.14 atm b) 5.14 atm c) 0.20 atm d) 0.35 atm 21. Which of the following atoms has the largest electronegativity? a) BI b) Ba c) At 22-In what condition a real gas behaves like ideal gas? d) T 3 4 5

Answer 1

1)) We have ,

2.4 atm = (2.4 * 760)mm of hg

= 1824mm of hg

Now, from Boyle's law, we have,

P1V1 = P2 V2

P1= 870 mm of hg

V1= 4.25 litres

P2 = 1824 mm of hg

V2 = ?

Thus, we have

P1V1 = P2V2

870 * 4.25 = 1824 V2

Thus, V2 = (870 *4.25)/ 1824

= 2.03 litres .....,......Answer.

2)) There are a total of 19 sigma and 4 pi bonds.

3))H3PO4 has a total of 32 valance electrons.

H :0; C::P: 0 ОН О. І. (H, Po4 )

4)) BH3 has central atom sp2 hybridised. Boron excites one of its electrons from 2s orbital to 2p orbital and undergoes sp2 hybridization , giving trigonal planer structure.

582 hybridisation B - 1 B TL as 2P e H (Trigonal Planer)

5)) from ideal gas law, we have,

PV = nRT

V= 0.505

n = 0.108

R = 0.0821

T = 20°c = 293k

Thus, we have,

P(0.505) = 0.108 * 0.0821 * 293

Thus, P = 5.14 atm

5)) At , astatine has the largest electronegativity.

6))A real gas behaves like an ideal gas at higher temperature and at lower pressure.

Hope it helps.

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